diff --git a/package-lock.json b/package-lock.json
index 8dd081c..2e82a4a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4689,12 +4689,14 @@
         "balanced-match": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -4709,17 +4711,20 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -4836,7 +4841,8 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
@@ -4848,6 +4854,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -4862,6 +4869,7 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
@@ -4869,12 +4877,14 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.2.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.1",
             "yallist": "^3.0.0"
@@ -4893,6 +4903,7 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -4973,7 +4984,8 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -4985,6 +4997,7 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -5106,6 +5119,7 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -7406,9 +7420,9 @@
       }
     },
     "mime": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/mime/-/mime-1.6.0.tgz",
-      "integrity": "sha512-x0Vn8spI+wuJ1O6S7gnbaQg8Pxh4NNHb7KSINmEWKiPE4RKOplvijn+NkmYmmRgP68mc70j2EbeTFRsrswaQeg==",
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/mime/-/mime-2.4.0.tgz",
+      "integrity": "sha512-ikBcWwyqXQSHKtciCcctu9YfPbFYZ4+gbHEmE0Q8jzcTYQg5dHCr3g2wwAZjPoJfQVXZq6KXAjpXOTf5/cjT7w==",
       "dev": true
     },
     "mime-db": {
@@ -13372,31 +13386,52 @@
       "dev": true
     },
     "superagent": {
-      "version": "3.8.3",
-      "resolved": "https://registry.npmjs.org/superagent/-/superagent-3.8.3.tgz",
-      "integrity": "sha512-GLQtLMCoEIK4eDv6OGtkOoSMt3D+oq0y3dsxMuYuDvaNUvuT8eFBuLmfR0iYYzHC1e8hpzC6ZsxbuP6DIalMFA==",
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/superagent/-/superagent-4.1.0.tgz",
+      "integrity": "sha512-FT3QLMasz0YyCd4uIi5HNe+3t/onxMyEho7C3PSqmti3Twgy2rXT4fmkTz6wRL6bTF4uzPcfkUCa8u4JWHw8Ag==",
       "dev": true,
       "requires": {
         "component-emitter": "^1.2.0",
-        "cookiejar": "^2.1.0",
-        "debug": "^3.1.0",
-        "extend": "^3.0.0",
-        "form-data": "^2.3.1",
+        "cookiejar": "^2.1.2",
+        "debug": "^4.1.0",
+        "form-data": "^2.3.3",
         "formidable": "^1.2.0",
         "methods": "^1.1.1",
-        "mime": "^1.4.1",
-        "qs": "^6.5.1",
-        "readable-stream": "^2.3.5"
+        "mime": "^2.4.0",
+        "qs": "^6.6.0",
+        "readable-stream": "^3.0.6"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        },
+        "readable-stream": {
+          "version": "3.2.0",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.2.0.tgz",
+          "integrity": "sha512-RV20kLjdmpZuTF1INEb9IA3L68Nmi+Ri7ppZqo78wj//Pn62fCoJyV9zalccNzDD/OuJpMG4f+pfMl8+L6QdGw==",
+          "dev": true,
+          "requires": {
+            "inherits": "^2.0.3",
+            "string_decoder": "^1.1.1",
+            "util-deprecate": "^1.0.1"
+          }
+        }
       }
     },
     "supertest": {
-      "version": "3.3.0",
-      "resolved": "https://registry.npmjs.org/supertest/-/supertest-3.3.0.tgz",
-      "integrity": "sha512-dMQSzYdaZRSANH5LL8kX3UpgK9G1LRh/jnggs/TI0W2Sz7rkMx9Y48uia3K9NgcaWEV28tYkBnXE4tiFC77ygQ==",
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/supertest/-/supertest-4.0.0.tgz",
+      "integrity": "sha512-e3UaSMkmVaPQ10MHqb5T9G1mb3L6MVUtLTxkVhKWndHfXyZylwtkjWXD9FzyHqlZ1/EPfeTJ+QDtmax5fb02cw==",
       "dev": true,
       "requires": {
         "methods": "^1.1.2",
-        "superagent": "^3.8.3"
+        "superagent": "^4.1.0"
       }
     },
     "supports-color": {
diff --git a/package.json b/package.json
index 38b9928..8edd9b9 100644
--- a/package.json
+++ b/package.json
@@ -70,7 +70,7 @@
     "jsdoc": "^3.5.5",
     "semantic-release": "^15.12.4",
     "standard": "^12.0.1",
-    "supertest": "^3.3.0",
+    "supertest": "^4.0.0",
     "travis-deploy-once": "^5.0.9"
   }
 }